Carbon stocks of finewoody debris in coppice oak forests at different development stages

Abstract

Dead woody debris is a significant component of the carbon cycle in forest ecosystems. This study was conducted in coppice-originated oak forests to determine carbon stocks of dead woody debris in addition to carbon stocks of different ecosystem compartments from the same area and forests which were formerly elucidated. Weight and carbon stocks of woody debris were determined with recent samplings and compared among development stages (diameter at breast height (DBH, D1.3m)), namely small-diameter forests (SDF) = 0-8 cm, medium diameter forests (MDF) = 8-20 cm, and large-diameter forests (LDF) = 20-36 cm). Total woody debris was collected in samplings; as bilateral diameters of all woody debris parts were less than 10 cm, all woody parts were in the "fine woody debris (FWD)" class. The carbon concentrations of FWD were about 48% for all stages. Mass (0.78-4.92 Mg·ha-1) and carbon stocks (0.38-2.39 Mg·ha-1) of FWD were significantly (p > 0.05) different among development stages. FWD carbon stocks were observed to have significant correlation with D1.3m, age, basal area, and carbon stocks of aboveground biomass (Spearman rank correlation coefficients; 0.757, 0.735, 0.709, and 0.694, respectively). The most important effects on carbon budgets of fine woody debris were determined to be coppice management and intensive utilization. Also, national forestry management, treatments of traditional former coppice, and conversion to high forest were emphasized as having substantial effects.